Yeah, that looks good. I sell software, hardware, accessories, and I've never had anything returned.
I've had items damaged, but nothing else.
I have explicit return policies such as:
Buyer must return item within 7 days of the end of auction. We will replace your item unless it is no longer available in which case we will pay a full refund. Returns/Refunds are at the sole discretion of the seller, and will be examined prior to issuance of a replacement or refund.
As I said, what you have now is good. Me personally, I never buy from a seller offering "As-is" or "No returns accepted"